Any of the quest givers will ask the Dragonborn for a drink. If the Dragonborn has any alcoholic beverages, the option to give it to the quest giver becomes available (although if the Dragonborn has Black-Briar Reserve, the target may not take it). However, if it works out, this makes the quest giver a friend and gives the Dragonborn the possibility to take any low-value items that belong to them, and they may also give the occasional gift.